Steam gun



FIG. 1 is a top, front and right side perspective view of a steam gun showing my new design;

FIG. 2 is a right side elevational view, the left side elevational view being a mirror image thereof,

FIG. 3 is an enlarged front elevational view thereof;

FIG. 4 is an enlarged rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a steam gun, as shown and described. 